Rock Identifier

Category

Mineraloid (Impact Glass)

Browse mineraloid (impact glass) specimens identified by the Rock Identifier community.

Learn about Mineraloid (Impact Glass) in the encyclopedia

Maskelynite

Pseudotachylite

Pseudotachylite

Moldavite

Suevite

Precious Coral (Red Coral) (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Coral (Red Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Polished mahogany obsidian (Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)) — igneous

Polished mahogany obsidian

Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)

Obsidian (likely black obsidian) (Volcanic glass, predominantly rhyolitic to dacitic silica-rich melt; approximate composition ~70–75% SiO₂) — igneous

Obsidian (likely black obsidian)

Volcanic glass, predominantly rhyolitic to dacitic silica-rich melt; approximate composition ~70–75% SiO₂

Quartzite (River-worn Shiner) (Quartzite (Formula: SiO2)) — metamorphic

Quartzite (River-worn Shiner)

Quartzite (Formula: SiO2)

Obsidian (Volcanic Glass (predominantly SiO2, approximately 70% or more)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2, approximately 70% or more)

Mahogany Obsidian (Volcanic glass (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic glass (SiO2 + Fe2O3)

Amber (Succinite (with a generalized formula of C10H16O)) — mineral

Amber

Succinite (with a generalized formula of C10H16O)

Mahogany Obsidian (Obsidian (volcanic glass with hematite/magnetite inclusions)) — igneous

Mahogany Obsidian

Obsidian (volcanic glass with hematite/magnetite inclusions)

Likely obsidian (rough fragment) (Volcanic glass, predominantly silica-rich rhyolitic composition (SiO₂-rich, noncrystalline)) — igneous

Likely obsidian (rough fragment)

Volcanic glass, predominantly silica-rich rhyolitic composition (SiO₂-rich, noncrystalline)

Black Obsidian (Volcanic glass (Amorphous silicates)) — igneous

Black Obsidian

Volcanic glass (Amorphous silicates)

Obsidian (Volcanic Glass (comprised primarily of SiO2)) — Igneous

Obsidian

Volcanic Glass (comprised primarily of SiO2)

Obsidian (black volcanic glass) (Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides) — igneous

Obsidian (black volcanic glass)

Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides

Amethyst (Water-Worn Pebble) (Silicon Dioxide (SiO2 with iron impurities)) — mineral

Amethyst (Water-Worn Pebble)

Silicon Dioxide (SiO2 with iron impurities)

Black Obsidian (Volcanic Glass (predominantly SiO2, Silicon Dioxide)) — igneous

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Opalite (Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)) — mineral

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Mahogany Obsidian (Volcanic Glass (SiO2 with Fe/Mg oxides)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 with Fe/Mg oxides)

Obsidian (Obsidian (volcanic glass)) — Igneous

Obsidian

Obsidian (volcanic glass)

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Black Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Obsidian (Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)) — igneous

Obsidian

Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)

Small yellow-orange mineral fragment, likely amber or iron-stained quartz (Possibly amber (fossilized resin; organic mineraloid) or quartz (SiO₂)) — mineral

Small yellow-orange mineral fragment, likely amber or iron-stained quartz

Possibly amber (fossilized resin; organic mineraloid) or quartz (SiO₂)

Amber (polished piece) (Fossilized tree resin; amber is an organic mineraloid, not a true mineral) — gemstone

Amber (polished piece)

Fossilized tree resin; amber is an organic mineraloid, not a true mineral

Yellow amber beads (Amber (fossilized tree resin; organic mineraloid, not a true mineral)) — gemstone

Yellow amber beads

Amber (fossilized tree resin; organic mineraloid, not a true mineral)

Opalite (Synthetic Moonstone/Opal) (Synthetic Silica Glass) — mineraloid (synthetic)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

mineraloid (synthetic)

Cullet (Slag Glass) (Amorphous Silica (SiO2) with various metal oxide colorants) — mineraloid / anthropogenic

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

mineraloid / anthropogenic

Polished black stone egg, probably black obsidian (Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements) — gemstone

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Obsidian (Volcanic Glass (Amorphous silicon dioxide with trace impurities)) — igneous

Obsidian

Volcanic Glass (Amorphous silicon dioxide with trace impurities)

Amber (Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)) — mineral

Amber

Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)

Tumbled amber (Amber (fossilized plant resin), commonly succinite; organic mineraloid) — gemstone

Tumbled amber

Amber (fossilized plant resin), commonly succinite; organic mineraloid

Slag (Ferrous slag (by-product of iron smelting)) — Mineraloid / Anthropogenic

Slag

Ferrous slag (by-product of iron smelting)

Mineraloid / Anthropogenic

Tumbled amber-like gemstone (Likely amber (fossilized resin; organic mineraloid), possibly citrine or yellow-brown glass imitation) — gemstone

Tumbled amber-like gemstone

Likely amber (fossilized resin; organic mineraloid), possibly citrine or yellow-brown glass imitation

Man-made Glass (Tumbled/Shaped) (Amorphous Silicon Dioxide (SiO2) with metal oxide colorants) — Mineraloid (synthetic)

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Mineraloid (synthetic)

Red Sandstone (Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)) — sedimentary

Red Sandstone

Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)

Opalite (Synthetic Opalised Glass) — mineraloid (synthetic)

Opalite

Synthetic Opalised Glass

mineraloid (synthetic)

Sea Glass (Amorphous Silica (SiO2) with various additives) — Mineraloid (Anthropogenic)

Sea Glass

Amorphous Silica (SiO2) with various additives

Mineraloid (Anthropogenic)

Amber (Succinite (fossilized resin)) — Organic Mineraloid

Amber

Succinite (fossilized resin)

Organic Mineraloid

Mahogany Obsidian Arrowhead (Volcanic Glass with Hematite/Magnetite inclusions (Amorphous Silicon Dioxide)) — igneous

Mahogany Obsidian Arrowhead

Volcanic Glass with Hematite/Magnetite inclusions (Amorphous Silicon Dioxide)

Opalite (Synthetic Fluorescent Glass (SiO2 + impurities)) — mineraloid (synthetic)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

mineraloid (synthetic)

Amber (Succinate (Succinite for Baltic varieties)) — Organic Mineraloid

Amber

Succinate (Succinite for Baltic varieties)

Organic Mineraloid

Slag (Industrial Glass Slag) (Amorphous Silica / Ferro-silicate Slag) — mineraloid / anthropogenic

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

mineraloid / anthropogenic

Opalite (Man-made Glass (SiO2 + additives)) — mineraloid (synthetic)

Opalite

Man-made Glass (SiO2 + additives)

mineraloid (synthetic)

Slag (Industrial Glass) (Artificial Vitreous Silicate) — mineraloid (anthropogenic)

Slag (Industrial Glass)

Artificial Vitreous Silicate

mineraloid (anthropogenic)